http://fatfractal.com/prod/tutorial/android/part-i/create-login/


http://a2zandroidtutorials.blogspot.kr/2012/07/login-screen-creation-using-alertbox.html


First, we need to create a new layout file. Create a file called login.xml in your layout directory, and enter the following code:

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<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:id="@+id/root"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <TextView
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:id="@+id/userNameTextView"
        android:text="User Name"
        android:textStyle="bold" />
    <EditText
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:id="@+id/userNameEditText"
        android:inputType="text" />
    <TextView
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:id="@+id/passwordTextView"
        android:text="Password"
        android:textStyle="bold" />
    <EditText
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:id="@+id/passwordEditText"
        android:inputType="textPassword" />
    <TextView
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:id="@+id/loginRegisterErrorTextView"
        android:textStyle="bold"
        android:gravity="center" />
</LinearLayout>

The resulting layout should look something like this:
5E74A457-CD1A-4A85-AFD7-DB5234FC8C711.png

Then add the following method to the Hoodyoodoo class. The method provides a login dialog that can be used from anywhere in the app:

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public AlertDialog loginDialog(Context c, String message) {
    LayoutInflater factory = LayoutInflater.from(c);           
    final View textEntryView = factory.inflate(R.layout.login, null);
    final AlertDialog.Builder failAlert = new AlertDialog.Builder(c);
    failAlert.setTitle("Login/ Register Failed");
    failAlert.setNegativeButton("OK", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int whichButton) {
            // Cancelled
        }
    });
    AlertDialog.Builder alert = new AlertDialog.Builder(c);
    alert.setTitle("Login/ Register");
    alert.setMessage(message);
    alert.setView(textEntryView);
    alert.setPositiveButton("Login", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int whichButton) {
            try {
                final EditText usernameInput = (EditText) textEntryView.findViewById(R.id.userNameEditText);
                final EditText passwordInput = (EditText) textEntryView.findViewById(R.id.passwordEditText);
                ff.login(usernameInput.getText().toString(), passwordInput.getText().toString());
            }
            catch (FFException e) {
                e.printStackTrace();
            }
        }
    });
    alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int whichButton) {
            // Canceled.
        }
    });
    return alert.create();
}

That’s it for the Hoodyoodoo class! Now we’re ready to move on and create some of the UI and controllers for the app!

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